67078769966569 has 3 divisors (see below), whose sum is σ = 67078778156733. Its totient is φ = 67078761776406.

The previous prime is 67078769966567. The next prime is 67078769966597. The reversal of 67078769966569 is 96566996787076.

The square root of 67078769966569 is 8190163.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 67078769966569 - 2¹ = 67078769966567 is a prime.

It is a super-2 number, since 2×67078769966569² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67078769966567) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4095082 + ... + 12285244.

It is an arithmetic number, because the mean of its divisors is an integer number (22359592718911).

Almost surely, 2^{67078769966569} is an apocalyptic number.

67078769966569 is the 8190163-rd square number.

67078769966569 is the 4095082-nd centered octagonal number.

It is an amenable number.

67078769966569 is a deficient number, since it is larger than the sum of its proper divisors (8190164).

67078769966569 is an frugal number, since it uses more digits than its factorization.

67078769966569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16380326 (or 8190163 counting only the distinct ones).

The product of its (nonzero) digits is 77774618880, while the sum is 91.

The spelling of 67078769966569 in words is "sixty-seven trillion, seventy-eight billion, seven hundred sixty-nine million, nine hundred sixty-six thousand, five hundred sixty-nine".